randombloke
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| posted on 4/1/12 at 12:57 PM |
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Hello Dusty sorry no definite answer to RC height but as for what stops it moving when you’re driving the answer is most definitely stiff springs!
The problem with roll centre is that it doesn't just move up and down but side to side as well. This is why the SAL is important. IMHO the roll
centre height isn’t important but keeping it from moving is.
My design process started with the things that I could define so I started with the wheel size, track width and chosen upright, with this I had the
location of the outer suspension connection points. Next I chose the ride height, my car is for road with very occasional track so I decided on 100mm
to keep it low but give reasonable clearance. Because I didn’t want to modify the steering rack from my donor the lower front chassis width was
dictated by the rack, so I now had the lower inner pickup points. I decided to go for a medium length SAL of 1700mm because I wanted to keep the outer
suspension geometry from gaining positive camber when cornering but also wanted the car to be stable in a straight line. Then all I had to do then was
draw a line from the IRC to the upper outer pickup point. With this geometry the RCH is about 75mm but I only bothered what the height was once I had
the rest of the geometry in place.
After drawing my design in Autodesk Inventor I needed tiny modification of wishbone length to stop the geometry gaining positive camber but now the
outside wheel is at zero camber whilst the chassis rolls to nearly 4 degrees.
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